| CPC H01R 13/745 (2013.01) [F16B 21/086 (2013.01); H01R 13/518 (2013.01); H01R 13/5202 (2013.01); H01R 13/62966 (2013.01)] | 8 Claims |

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1. An add-on housing having a frame-like basic shape which surrounds a receiving region for receiving a contact insert or a retention frame which is provided with plug-type connector modules,
wherein at least two fastening faces having fastening openings are formed on the frame-like basic shape,
wherein the add-on housing has snap-fastening devices which, in order to mechanically fasten the add-on housing to a wall aperture of a device wall, engage through the fastening openings, and
wherein each of the snap-fastening devices has a case-like base member, and wherein resiliently supported base portions protrude from mutually opposing narrow faces of the case-like base member to engage the device wall.
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